Lawmakers, who had cast aside a conservative push to allow religious objectors to refuse service to same-sex couples, waved rainbow flags and embraced on the floor of the chamber, after the overwhelming vote in favour of the bill.
The annual US-South Korean "Vigilant Ace" exercises feature 230 aircraft, including a range of the US military's most advanced stealth warplanes, and come a week after North Korea tested its most powerful intercontinental ballistic missile (ICBM) to date which it says can reach the mainland United States.
The Islamist group Hamas urged Palestinians on Thursday to abandon peace efforts and launch a new uprising against Israel in response to US President Donald Trump's recognition of Jerusalem as its capital.
A Palestinian envoy said the Trump decision was a declaration of war in the Middle East. Pope Francis called for Jerusalem's status quo to be respected, saying new tension would further inflame world conflicts. China and Russia expressed concern the plans could aggravate Middle East hostilities.